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Downtime analysis of drilling machines and suggestions for improvements

机译：钻机停机时间分析及改进建议

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Purpose - The purpose of this paper is to analyse and compare the downtime of four drilling machines used in two underground mines in Sweden. The downtime of these machines was compared to show what problems affect downtime and which strategies should be applied to reduce it. Design/methodology/approach - The study collects failure data from a two-year period for four drilling machines and performs reliability analysis. It also performs downtime analysis utilising a log- Iog diagram with a confidence interval. Findings - There are notable differences in the downtime of most of the studied components for all machines. The hoses and feeder have relatively high downtime. Depending on their downtime, the significant components can be ranked in three groups. The downtime of the studied components is due to reliability problems. The study suggests the need to improve the reliability of critical components to reduce the downtime of drilling machines. Originality/value - The method of analysing the downtime, identifying dominant factors and the interval estimation for the downtime, has never been studied on drilling machines. The research proposed in this paper provides a general method to link downtime analysis with potential component improvement. To increase the statistical accuracy; four case studies was performed in two different mines with completely different working environment and ore properties. Using the above method showed which components need to be improved and suggestions for improvement was proposed and will be implemented accordingly.
机译：目的-本文的目的是分析和比较瑞典两个地下矿井中使用的四台钻机的停机时间。对这些机器的停机时间进行了比较，以显示哪些问题会影响停机时间，以及应采用哪些策略来减少停机时间。设计/方法/方法-该研究从四年的时间内收集了四台钻机的故障数据，并进行了可靠性分析。它还使用带有置信区间的log-Iog图执行停机时间分析。调查结果-所有机器的大多数已研究组件的停机时间都存在显着差异。软管和进料器的停机时间相对较长。根据停机时间的不同，重要组件可以分为三类。所研究组件的停机时间归因于可靠性问题。这项研究表明需要提高关键部件的可靠性，以减少钻孔机的停机时间。原创性/价值-从未在钻机上研究过分析停机时间，识别主要因素以及停机时间间隔估计的方法。本文提出的研究提供了一种将停机时间分析与潜在组件改进联系起来的通用方法。提高统计准确性;在两个工作环境和矿石性质完全不同的不同矿山中进行了四个案例研究。使用上述方法表明需要改进哪些组件，并提出了改进建议，并将相应地实施。

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